package com.ego.common.util;

import com.ego.common.exception.GlobalException;

import java.security.MessageDigest;
import java.util.UUID;

/**
 * @program: ego
 * @description: Token生成器
 * @author: KamTang
 * @create: 2022-11-11 11:24
 **/
public class TokenGenerator {
    public static String generateValue() {
        return generateValue(UUID.randomUUID().toString());
    }

    private static final char[] HEX_CODE = "0123456789abcdefghijklmnopqrstuvwxyz".toCharArray();

    public static String toHexString(byte[] data) {
        if (data == null) {
            return null;
        }
        StringBuilder r = new StringBuilder(data.length * 2);
        for (byte b : data) {
            r.append(HEX_CODE[(b >> 4) & 0xF]);
            r.append(HEX_CODE[(b & 0xF)]);
        }
        return r.toString();
    }

    public static String generateValue(String param) {
        try {
            MessageDigest algorithm = MessageDigest.getInstance("MD5");
            algorithm.reset();
            algorithm.update(param.getBytes());
            byte[] messageDigest = algorithm.digest();
            return toHexString(messageDigest);
        } catch (Exception e) {
            throw new GlobalException("生成Token失败", e);
        }
    }
}
